“navigational aid”的概念、定义、翻译、参考文献-科学参考

单词	navigational aid
释义	navigational aid [´nav·ǝ`gā·shǝn·ǝl `ād] ^NAVIGATION An instrument, device, chart, method, or such, intended to assist in the navigation of a craft; this expression should not be confused with ``aid to navigation,'' which refers only to devices external to a craft.
随便看	derivative rock derivative thermometric titration derivatized gelatin derived curve derived fuel derived gust velocity derived quantity derived set derived sound system derived unit dermabrasion Dermacentor Dermacentor andersoni Dermacentor variabilis dermal dermal bone dermal denticle dermalia dermal pore Dermaptera Dermatemydinae dermatitis Dermatocarpaceae dermatocranium dermatogen

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